Create Online Designer

I want an online business card designer built that will allow for someone to go in and design their own business cards with pre-loaded fonts and backgrounds. I also want them to be able to submit those files and place the order and pay for the order all at one time. I want to use paypal to accept payment for the order. This needs to be very user friendly. This will be integrated into my current website at [login to view URL] it can be run out of a database if needed and can be placed on a sub-domain if it needs to be stand alone. Examples of projects like this would be a plus.